1) Mr.John has been principal of our school since last year(HTHT,DHNB: since)

2) Violets bloom in Spring(HTĐ, DHNB: Đây là 1 điều hiển nhiên)

3) We haven't live in England for 2 years now(HTHT, DHNB: for)

4) They are preparing the Christmas dinner at home now(HTTD, DHNB: now)

5) George has worked at the university so far(HTHT,DHNB: so far)

6) She has learned German for 2 years((HTHT,DHNB: for)

7) Tom moved to this town in 1994(QKĐ, DHNB: in)

8) Look! That man is trying to open the door of your car(HTTD, DHNB: look!)

9) Listen! They are learning a new song(HTTD, DHNB: Listen!)

10) Martin cycled for 50 miles on scenic routes three weeks ago(QKĐ,DHNB: ago)

11) David is repairing the TV set at the moment(HTTD,DHNB: at the moment). He has worked at it for one hour(HTHT,DHNB: for)

12) I can't go with you because I haven't finished my homework yet(HTHT,DHNB: yet)

13) John is washing his hands now(HTTD,DHNB: now). He has just repaired the bike(HTHT,DHNB: just)

14) My friend was in Canada two years ago(QKĐ, DHNB: ago)

15) Three people visited him in hospital last Friday.(QKĐ, DHNB: last)

CHÚC EM HỌC TỐT

1. has been

since -> HTHT

2. bloom

hành động diễn ra thường xuyên -> HTĐ

3. haven't live

for + khoảng thời gian -> HTHT

4. are preparing

at the moment -> HTTD

5. has worked

so far -> HTHT

6. has learnt

for + khoảng thời gian -> HTHT

7. moved

in 1994 -> QKĐ

8. is trying

Look! -> HTTD

9. are learing

Listen! -> HTTD

10. cycled

three weeks ago -> QKĐ

11. is repairing, has worked

at the moment -> HTTD

for + khoảng thời gian -> HTHT

12. haven't finished

yet -> HTHT

13. is washing, has just repaired

now -> HTTD

just -> HTHT

14. was

two years ago -> QKĐ

15. visited

last Friday -> QKĐ